On chat forums/boards these are things that are usually found under the main messege. Usually they eaither provide a link to some place, list a current goal, or say a witty phrase. Usually seperated from the main messege with a series of ----.

1. I was scanning over the posts to my forum and I saw the funniest siggys in the world!

2. (There usually in this format)
-Long boring messege no one cares about-
---------------------------------
-siggy with something funny in it like, 'if abuse is illagal, was is there school?'

an abreviation of the word signature. more specifially a basketball players signature shot. the actual shot called "siggy" originated from my friend Travis who would shoot a granny shot extremley high and over time it went from being called his signature to simply his "siggy". to shoot a siggy first u must cock the ball between your legs and then launch it into the air currents (as high or higher than the backboard). lastly as you release the ball you must yell the word "siggy" in a high pitched annoying voice (much like the sound a dog makes when it is kicked in the stomach)

awesome, wow she's so awesome words can't describe.
usually has red hair, and a beautiful face and personality.
funny as girl, who is secretly a clown inside although she is quite shy, once you get to know her she bursts out like a beautiful butterfly and is so outgoing, maybe at times annoying. but always lots of fun!